Source : Free On-Line Dictionary of Computing

Green Book
     
        1.   Informal name for one of the four standard
        references on {PostScript}.  The other three official guides
        are known as the {Blue Book}, the {Red Book}, and the {White
        Book}.
     
        ["PostScript Language Program Design", Adobe Systems,
        Addison-Wesley, 1988 (ISBN 0-201-14396-8)].
     
        2.  Informal name for one of the three standard
        references on {SmallTalk}.  Also associated with blue and red
        books.
     
        ["Smalltalk-80: Bits of History, Words of Advice", by Glenn
        Krasner (Addison-Wesley, 1983; QA76.8.S635S58; ISBN
        0-201-11669-3)].
     
        3.   The "X/Open Compatibility Guide", which
        defines an international standard {Unix} environment that is a
        proper superset of {POSIX}/SVID.  It also includes
        descriptions of a standard utility toolkit, systems
        administrations features, and the like.  This grimoire is
        taken with particular seriousness in Europe.  See {Purple
        Book}.
     
        4.   The {IEEE} 1003.1 {POSIX} Operating Systems
        Interface standard has been dubbed "The Ugly Green Book".
     
        5.   Any of the 1992 standards issued by the
        {ITU-T}'s tenth plenary assembly.  These include, among other
        things, the dreadful {X.400} {electronic mail} standard and
        the Group 1 through 4 fax standards.
     
        6. {Green Book CD-ROM}.
     
        See also {book titles}.
     
        [{Jargon File}]
     
        (1996-12-03)